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Mr Black has two sons, one of ________working as a doctor.
A．themB．whoC．whomD．whose
A

試題分析：句意為：布萊克先生有兩個兒子，其中的一個是一名醫(yī)生。逗號之后沒有謂動詞，此處不是一個句子，因此也就排除了非限制性定語從句的可能，這里應(yīng)是一個獨立主格結(jié)構(gòu)，其構(gòu)成方式為：n/pron+doing/done/to do. one of them與working 之間的關(guān)系為主動，前面缺少主語的格式，故為one of them,
而one of +whose/who/whom為非限制性定語從句關(guān)系詞。所以答案應(yīng)為A
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